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Related Experiment Videos

Radioimmunoassay for methotrexate using hydroxyethylmethacrylate hydrogel.

K J Tracey, R Mutkoski, J A Lopez

    Cancer Chemotherapy and Pharmacology
    |January 1, 1983
    PubMed
    Summary

    A new solid-phase radioimmunoassay (RIA) method accurately measures methotrexate in biologic fluids. This hydroxyethylmethacrylate-based assay (HEMA-RIA) offers a sensitive and rapid quantification of methotrexate levels.

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    Area of Science:

    • Biochemistry
    • Analytical Chemistry
    • Immunology

    Background:

    • Accurate measurement of methotrexate is crucial for therapeutic drug monitoring.
    • Existing methods may lack the sensitivity or speed required for rapid clinical assessment.
    • Development of novel immunoassay techniques can improve drug quantification.

    Purpose of the Study:

    • To develop a sensitive and rapid solid-phase radioimmunoassay (RIA) for measuring methotrexate in biologic fluids.
    • To characterize the performance of the hydroxyethylmethacrylate-based RIA (HEMA-RIA) system.
    • To evaluate the HEMA-RIA system's utility in pharmacokinetic studies.

    Main Methods:

    • Polymerization of hydroxyethylmethacrylate monomer with rabbit antimethotrexate antisera to create antibody-bound gels.

    Related Experiment Videos

  • Lyophilization, grinding, and aliquoting of gels into syringes with fritted filter discs for solid-phase extraction.
  • Validation using radiolabeled methotrexate and construction of dose-response curves.
  • Application of the HEMA-RIA system to analyze methotrexate levels in baboon serum after IV injection.

    • Main Results:

    • The HEMA-RIA system demonstrated high sensitivity, measuring drug concentrations below 1 ng/ml.
    • Control gels without antibodies did not bind radiolabeled methotrexate, confirming antibody specificity.
    • A clear dose-response curve was established, correlating bound methotrexate with antiserum concentration.
    • Pharmacokinetic data from baboon studies using HEMA-RIA correlated with established enzyme assay results.

    Conclusions:

    • The developed HEMA-RIA system provides a stable, efficient, and rapid method for methotrexate measurement.
    • Simple filtration enables effective separation of bound antigen, simplifying the assay procedure.
    • This assay is suitable for sensitive quantification of methotrexate in biologic fluids and pharmacokinetic evaluations.